package com.example.springframework.core.io;


import cn.hutool.core.lang.Assert;
import com.example.springframework.util.ClassUtils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
public class ClassPathResource implements Resource{

    private final String path;

    private ClassLoader classLoader;

    public ClassPathResource(String path) {
      this(path,(ClassLoader) null);
    }

    public ClassPathResource(String path, ClassLoader classLoader) {
        Assert.notNull(path, "Path must not be null");
        this.path = path;
        this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        InputStream resourceAsStream = classLoader.getResourceAsStream(path);
        if (null==resourceAsStream){
            throw new FileNotFoundException( this.path + " cannot be opened because it does not exist");
        }
        return resourceAsStream;
    }
}
